Why not have the hallways between each "set" be like a cruise ship with water sounds and seabirds and such, but each set/ scene is a "port of call", that way the cruise ship theme is just a vehicle to get you to different locations, I can imagine a head hunter island set, and several others that could be "fear ports".

That might work. I know they had some good room ideas like the steerage section, the boiler room of the ship, captains quarters, that sort of thing I'm just struggling with how to design my layout in a basement.

You could set your walls up to look like the wall in a cruise ship, with the port holes and such have almost like a stormy weather scene painted on the window and the sideways rooms. For your sideways rooms heres my thought on that, now bare with me and let me know if you get lost, but i would take at least 2 palletsand nail them together but turn them sideways so that front where you put the jack to lift them up is on the sides. take a 7-8 peice of steel tubing enough to hold a few hundred pounds and drill a hole in the center of the pallet on the side. So if your looking at the pallets now the tube should be at the bottom this way the set up will tilt to the left or right when stood upon maybe put some springs on the ends underneath to give it the slow tilting effect like being on a ship alsoo build like a step or 2 to hide the pipe and so no one trips and build hand rails too this way groups have something to grab on to and repeat steps on other side and wa la . If your confused at at im sorry tried drawing ya a picture but the file size is too big and it was a pain in the butt to fix it but this should give ya a simple way to do it!!